Process of making pulleys



March 27, 192s. 1,664,360

. W. D. HAMERSTADT 4PROCESS 0F MAKING PULLEYS www Filed NOV. 24. 1925um( V @man Patented Mar. 27,19%.

UNITED STATES Laatste Ppi-Ar sur Vorrrcr:".,

WIELIAM D. HAMEnsrAD'n, or; INDIANAPQLIS, rrr-mauri, Assrsuor.' Tonoonu/'oonv MnNUFAcTURING, COMPANY, cir-INDIANAPOLIS;rNDIANA, AcoaroRA'rroN'..

Pnoefass ,or iti-Anm@ romanes.

Application filed. November 24,. 1925. Seri'alf'No. 71,1580.

ing a metal4 hub with a metal web radiating.

therefrom with av paper or 'iibre pulley shell formed on transverse.arms provided onV the end of the web.v

Heretofore such pulleys have been made'by casting the hubv and Webin theusual manner with a plurality of transverse pins formed or ,securedabout the peripheral edge olf-the web upon which paper or librelaminations arez'mountedand compressed, as shown in Letters Pate-nt No1.1,223,165.y v

`The object of this invention is to constructa pulley of t-his type byvforming a. plurality of transverse bores through. the libre-shelly anddie casting the huband webv with the transverse pins integral therewithformed in the bore provided in the' shell'. This has the effect of notonly reducing the cost of construction, but causing the transverse pinsto be embedded, intel-locked. or bonded. with the shell so' as to firmlybind the metallic hub support and shell together as-Well as L secure thelaminations in their compressed relation to each other Vas disclosed inLetters Patent No. 1,535,134.

Another feature of the invention resides in simultaneously applyingpressure to the metal and to the fibre shell during the die castingprocess, the pressure exerted on the shell .being greater than thatapplied to tne metal during the die casting, whereby the paper or fibrelaminations Will be tightly compressed and the density thereof increasedin which condition they will be permanently maintained by the bonding orinterlocking Y eect of the die `casting.

The full nature of the invention Will be understood from theaccompanying drawings and the following description and claims.

Fig. 1 is a perspective view of a pulley structure of this type. Fig. 2is an enlarged section taken on a line 2-2 of Fig.11. Fig. 3 illustratesthe arrangement of the fibre laminations before being subjected to theprocess. Fig. 4 is a section taken through the die employed with thefibre shell placed in position for receiving the metal casting.

In the drawings there is shown a pulley having a shell formed of aplurality of fibrous rings or laminations such as paper or the like.Said rings are provided With a plurality of transverse bores 11extending from one side to the other or from adjacent one sido tov apoint adjacent the other sid-'e as may be desired, saidf bores areformedat intervals about ther shell and are spaced substantiallyeq;ui-distant between the in'ner and outer surfaces thereof.Intermediate ythev sides of they shell and extendingabout the in.-v nersurface thereof there is 'form-eden inwardly extending, groove 12communicating with the respect-ive bores 11. The supporting structure ofthe :pulley comprises the metallic hub 123` formed with a radiatingWeb14whicli is formed lintegral in thev manner hereinafter ydescribed,`with the transverse pins 15 adapted to extend through the bores 11,saidfW-eb `V14 connecting' said pins through. the recess or'opening 12formed the: shell. l The metallicstructure isjoi-rred ywithy the fibreshell `by a die casting process. The. process!A employed inconstructing' a pulley' :off this character consistsin providing a pair'of oppositely disposed die -blocks 1.5 and 1.6, which may be `mountedonf the' usual. die' easting machine'.V Thetdieslare provided in' theirconformation' with the annular shoulders 17 upon which a plurality oflaminated rings as shown in Fig. 3 may be mounted or built up. Theshoulders 17 Will support them in proper position and alignment, or theymay be temporarily Vclamped together by any other suitable means. Thedie blocks 15 and 16 are thereupon brought together so as to clamp therings forming the shell 10 together and compress them to about or 25% oftheir natural Width, increasing their density accordingly. The die 15 isprovided with thc core 18 Which is adapted to extend into acorresponding recess 19 formed in the block 16. The die 15 is alsoprovided With a nozzle '20 formed therein which Will conduct the moultenmetal to the hub forming chamber i surrounding the core 18. The metaldiS- charged therein under high pressure Will be forced around the core18 toform the hub 13 and into the space between the surfaces ofthe diesto form the web 14 and thence into the the metal, such pressures beingcreated simultaneously. The metal forced under pressure into the bores11 will penetrate the'softer portions of the fibrous surface, and extendn into any irregularities thereof as well as bond itself with the fibresso as to create a bonding or interlocking effectwith the laminationswhile held under high pressure. Consequently, upon the metal hardeningand the dies being removed, the density of the fibrous shell created bythe pressure will be maintained by reason of the interlocking or bondingeffect of the metal.

While as herein shown, the structure may embody a solid web, the web maybe spokelike in structure if desired, Without departing from the spiritof this invention. In this instancefthe process of constructing thepulley would be the same, it necessitating only an alteration in theshape of the die blocks. the hub and transverse pins, each spokeextending radiallyfr'om the hub toits respective pin.

The invention claimed is:

1. The process'of forming a laminated paper pulley having a metallic huband web for'supporting the same, consisting in providing a. pair of diemembers spaced apart intermediate their peripheries to.fr1n a webtherebetween, and to form an annular recess for receiving and clampingtherebetween the laminated fibre rim, providing a core on one of saiddie blocks extending centrally therefrom to the other die block and sur-The spokes would be-integral withy rounded with a recess to provide ahub portion,rforming a plurality of transversely extending bores throughsaid rim, forming a recess about the inner eriphery of. Vsaid rim incommunication wity said bores, suitably clamping the same between saiddie blocks under such pressure as to reduce the width thereof andincrease the density of the fibre, and die casting metal between saiddie blocks under sufficient pressure to force it into said bores throughsaid recesses and into the intervening space between said blocks andtheYspace surrounding said bore for forming transverse pins through saidrim in bonded relation'with the fibrous surface thereof and forming ahub and web integral therewith.l

2. The process of forming aA laminated libre pulley having a metallichub and web portion, consisting in providing a `pair of oppositelydisposed die members, forming a plurality of transverselyv extendingbores through said laminated fibre rim, providing a recess about theinner periphery of said rim in communication .with each of lsaid bores,providing suitable openings in said die members for forming a web andhub portion, said openings communicating with said recess, anddischarging meta-l therein under pressure for forcing it into saidopenings, recess and bores for causing said metal to bond wit-h thefibre laminations and form said hub and recess integral therewith.

In witness whereof, I have hereunto affixed my signature.

WILLIAM D, IIAMERSTADT.

